Robin,
I think that scale looks terrific. Barbara, can you manage those small increments on the syringe?
Barbara, is there room between the bottom of the door and the carpet for a throw rug? Let her toss that all around the room if she wants! Or, if she can see light below the door, and that's why she's trying to get out, remove the "light". You can use a rolled up towel or one of those draft stopper things to make her forget the doorway is the "way out" maybe.
Carl